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QSC Audio SC-423 User Manual

Sc-423, Cinema loudspeaker system

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Developed specifically for the unique requirements
of professional motion picture playback, the SC-423
extends QSC’s commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-423 is a 3-way, selectable bi or tri-amplified
screen channel loudspeaker system comprised of two
main units—the MH-1063 mid-high frequency system
and the LF-4215 low-frequency system.

The MH-1063 mid-high system features a high
output, horn loaded 10" midrange cone driver and
a 2.5" (63mm) titanium diaphragm compression
driver mounted to an adjustable pan and tilt bracket.
The MH-1063 includes a driver protection network
and a passive crossover for bi-amp operation. Power
limiter circuitry protects the high-frequency driver
from overpowering. The MH-1063 provides extended
frequency coverage for the critical midrange band. A
high power 10" cone driver allows operation as low
as 250 Hz and the advanced phase plug coupling
permits a crossover point of up to 1800 Hz to the
high-frequency horn. This ensures that most of the
dialog range is reproduced by a single element, for
unmatched intelligibility.

The LF-4215 dual 15" (381 mm) low-frequency
enclosure is designed specifically to address the
extended low-frequency response required for cinema
applications. The LF-4215 covers the frequency range
from 35 Hz to 250 Hz. Close Coupled Woofers (CCW),
with their tight spacing between woofers, improves
coupling and keeps coverage angles wide over a greater
frequency range than more widely spaced designs.

The SC-423 is designed for ease of installation.
The MH-1063 components come pre-assembled to
reduce field assembly time. Three bolts are all that
are required to secure the MH-1063 to the top of the
LF-4215 enclosure.

SC-423

Cinema Loudspeaker System

Specifications

SC-423

Nominal Coverage

90° horizontal x +20 to -30° vertical

Frequency Range

32 Hz – 16 kHz (-6 dB)

Crossover Frequency

250 and 1700 Hz, 24 dB per octave

LF-4215

MH-1063

Impedance

Sensitivity 1 watt /1 meter,

99.5 dB

Bi-amp

Tri-amp

half space

105 dB

MF 105 dB HF 107.5 dB

Maximum Input Power

1

8 hours of 6 db crest factor

800 W RMS

250 W RMS

2

275 W RMS 60 W RMS

IEC 268 noise spectrum

2 hours of 6 db crest factor

1000 W RMS

350 W RMS

pink noise, 50 Hz – 20 kHz,

AES method

Recommended Amplifier Power 1600 W RMS maximum

800 W RMS maximum

Recommended Processing

Subsonic filter below 30 Hz,

4th order LR crossover at 200 and 1700

> 18 dB per octave

Hz via QSC DCM or QSControl.net™

Connectors

Barrier strip screw terminals

Barrier strip screw terminals

accept up to #10 AWG

accept up to #10 AWG stranded wire

stranded wire

Transducers

Two 15" (381mm) high efficiency, 10" high efficiency mid range,
extended bass woofer featuring 1.5" (38mm) exit, 2.5" titanium
4" copper voice coils

diaphragm compression driver

Enclosure

Quasi B4 alignment, ported

Tilt/Pan Bracket

enclosure with fully flared ports,

±10° vertical tilt

symmetrical port design, tuned to ±10° horizontal pan
36 Hz, constructed of MDF and
heavily braced. Features vandal
resistant woofer mounting bolts

Dimensions (HWD)

36" x 30" x 20.3"

39" x 30" x 20"

(910 mm x 762 mm x 516 mm)

(990 mm x 762 mm x 508 mm)

Weight – Net

172 lb (78 kg)

85 lb (39 kg)

System Weight

257 lb (117 kg)

Baffle Cut-Out

76" x 32"

1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.
2) Maximum input power tested in accordance with IEC 268-5 recommendations, 200 Hz – 2 kHz band limiting, 6 dB signal crest factor.

passive

mid-high

Features

• 3-way selectable, bi or tri- amplified screen channel system

• MH-1063 provides 90° horizontal by +20° to -30° vertical coverage

• LF-4215 is constructed of MDF and is heavily braced

• Low-distortion waveguides provide highly articulate dialogue

• Shallow depth (20") facilitates installation

• THX™ approved for professional cinema applications